ULC overload fault

What does 8002 mean?

The selected signal has exceeded the user overload curve, indicating an overload condition. This often means the motor is under too much mechanical stress or there's a problem with the process being controlled. Sustained overload can lead to motor damage or premature wear.

• Excessive mechanical load on the motor (e.g., jammed conveyor, seized bearing, clogged pump impeller).
• Motor current has exceeded the configured overload curve threshold (e.g., parameter P7-31 'Overload curve 1 current').
• Process conditions have changed (e.g., increased viscosity, higher flow rate) requiring more power than the motor can deliver.
• Incorrectly configured overload curve parameters (e.g., P7-31, P7-32, P7-33) causing a trip during normal, high-load operation.
• Motor supply voltage sag, causing the motor to draw higher current to maintain required torque.

Click steps to track your progress.

1. 1

   Inspect the mechanical system for obstructions, seizing components (bearings, gearboxes), or material build-up that could increase motor load.

2. 2

   Monitor the motor's actual current (e.g., via drive display or P_ACT_CURRENT) and compare it to the configured overload curve (P7-31 to P7-33).

3. 3

   Verify the incoming AC mains voltage at the drive's input terminals during operation for significant sags or imbalances.

4. 4

   Review and adjust the overload curve parameters (P7-31: Overload curve 1 current, P7-32: Overload curve 1 speed, P7-33: Overload curve 1 delay) to accurately reflect the application's maximum acceptable load.

5. 5

   Measure motor insulation resistance using a megohmmeter (with drive disconnected) to check for internal winding damage contributing to higher current draw.